In my experience, Journey to the Centre of the Earth is rarely ever "walk on". I've only "walked on" Journey ... maybe within the first 45 to 60 minutes of opening and within ... maybe 15 minutes or so of closing. Even then, it was still a 20+ minute wait in line as you make your way to the actual ride.
But, the app is obviously throwing everything into chaos. And I think Journey is closed in November.